I actually don't disagree with much that you've said here. For what it's worth, my original argument started in and is based on the very beginning of the manga as I believe only two chapters had been released at the time. Things were still tense and awkward between the two main characters. It was written fairly well (not great, but not enough to warrant the review bombing which was my point) in that regard. Many things would have played out different save for the core plot device (which exists to force them into interacting). I will also say that kids in college are still really fucking stupid and our characters are only freshmen. As far as I'm concerned, college kids are just as dumb as high school kids, but just happen to be legally considered adults. It's been 15 years and my friends and I still joke about the asinine and cringe stuff we did has college kids (and not just as freshmen, either). They also have a history and histories are often worth fighting for (I've had big fights with all my friends, but we've come through. That's not to say every relationship can be salvaged, but many can be).
I guess for context on my preferences, I don't mind love triangles or what have you. I don't really crave them, though. I just like relationships that form over time and hit various obstacles along the way. It doesn't have to be super dramatic or anything, but, in real life, the strongest relationships are the ones that have overcome adversity. I very much do not like romantic plotlines where two characters are just magnetically drawn to each other immediately from the start and just act sweet and lovey dovey the whole time. That's not how relationships tend to work. Enemies to lovers is a big trope I like. Childhood friends is also a big one for me since it implies a lot of history before any romantic feelings come to fruition. Love at first sight is basically anathema to my tastes. Many of my favorite romantic manga/plotlines feature characters who end up with someone completely different to who they were looking for at the start. Some of my absolute favorites even end with a break up because they learn they weren't good for each other, but their relationship with each other was important for their growth as people.
I don't disagree with your take on this manga in particular. This manga is far from perfect. I just don't think it's any worse that any of the other romance people flood to.
That said, and I'm sorry to restate this, but the Russian-speaking romcom just flops for me. I'm sure a lot of people like the characters (like, actually, I am 100% sure of it because it's wildly popular and I can never get away from it), but, from the effort I put in to read it, not a single character landed well for me. They were just too flat and the premise struck me as way too wish fulfillment-y. It's just subjective taste. If me calling it garbage offended you, I am sorry. That said, I will not rescind my statement nor my opinion. That also said, my negative opinion of it should not impede your enjoyment of it. By all means, please continue enjoying it.
